单项选择题

A new war broke ______ between the two countries.

A. out
B. down
C. up
D. off
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单项选择题
It is a good habit to ______ new words in the dictionary.
A. look through
B. look like
C. look out
D. look up
单项选择题
If he can ______ smoking for months, his health will improve.
A. keep up
B. keep up with
C. keep off
D. keep from
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